Help on understanding noapic nolapic noacpi/acpi=off boot options

["Juan P. Rigol Sanchez" <jprigol@ujaen.es>]

Hi all,

I have installed (after several attempts) debian lenny amd64 on a new HP
Compaq dc7700 pc (intel core 2 duo 6600 with integrated Q963/Q965
chipset & graphics), but the system hangs if "noapic nolapic noacpi
acpi=off" options are not given at boot time.
I was wondering how these options affect normal operation of the pc
(fan/cooling, peripherals?, performance??)
(kernel 2.6.21-2-amd64 x86_64 ; with 2.6.18-4-amd64 boots using just
acpi=off).

Thanks in advance.

Regards,
Juan P. Rigol